Load times when testen simple iOS on iPhone is horrible.. What to do?

When testing iOS prototype on iPhone via Usernote(no JS), the app is extremely slow due to only being 1.7mb, having 3 screens using in total 2 buttons, and 1 image map link.

How come is it so slow?

I test on both wifi and 3g with good connection.

I have added the prototype as a home screen icon to get rid of the safari nav bars, but the app is so slow i wont be able to make user tests as people should not wait 3 seconds before any event is taking place.

We opened the file you sent us and we find that the prototype loads slowly because you have a 500Kb image that needs to be downloaded the first time you view the prototype..Also, it's very probably that the prototype is loaded slowlier on your iPhone because you may be using WiFi and its maximum data transfer speed isn't as high as using an ethernet cable.

You could try do anything that reduce the size of the image file and obviously the image will be loaded faster. You can reduce the quality by using jpg images instead of png's. Also you can use a non-scaled image, currently you are using a large image and you are reducing its size on Prototyper.